Residential Wood Floor Joist Span Table

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Residential wood floor joist span table.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. The maximum span is measured o c. These tables can also be used to determine deck joist span. Joists rafters simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. Lp solidstart i joists technical guide for residential construction lpi. Span tables for domestic floor joists to bs 5268 7 1 note.

Floor joist span tables for various sizes and species of wood joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2. The spans are based on simple span joists. Made of engineered wood substrate a renewable resource. True floor joist span calculations can only be made by a structural engineer or contractor.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel. Low pitch 6 12 or less 14 15 roof span tables. The apa mark of quality.

The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Of bearings and is based on uniformly loaded joists. Dead load deflection is limited to l 360 and total load deflection is limited to l 240.

Reading the table you ll see that 2 x 8s installed 16 apart on center can span 12 4. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. Since the example house we are designing for is 12 feet wide we need to find in the floor joist span table a joist size and centering that can span 12 or wider. High pitch 6 12 to 12 12 16 17 load bearing cantilever tables 18 21.

So our house would look like the picture below with all floor joists 2 x 8. View joist rafter tables.